ybrowser.exe is a process from Yahoo! which offers additional functions to Internet Explorer. "This program is a non-essential system process, and is installed for ease of use. "
Non-system processes like ybrowser.exe originate from software you installed on your system. As most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated harmful errors. It is recommended that you check your registry to identify hidden errors now.

yupdate.exe is a yupdate
belonging to Yandex Software Update Checker
from ООО "ЯНДЕКС"
Non-system processes like yupdate.exe originate from software you installed on your system. As most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated harmful errors. It is recommended that you check your registry to identify hidden errors now.

yupdater.exe is a process belonging to the Yahoo Messenger Internet chat program and is responsible for online updates. "This program is a non-essential process, but should not be terminated unless suspected to be causing problems. "
Non-system processes like yupdater.exe originate from software you installed on your system. As most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated harmful errors. It is recommended that you check your registry to identify hidden errors now.